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Senior Republicans grow ever more concerned by their nominee’s erratic behaviour
The Republican candidate’s base of support is much broader than first thought
Party establishment asks which outsider is lesser of two evils
Brash candidate’s latest salvo troubles even former defenders in his party
Political brinkmanship once again raises the spectre of a default
Many Republicans argue the Wisconsin congressman is only member who can unite the party
Legal action as independents say rules bar them from being heard
Former Florida governor joins crowded race for White House
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